August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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156
｜
第
18
章
18.2
创建一个计算字段
在
Tableau Prep
中创建计算字段主要有两种方法。创建计算字段的第一种方法是，
在显示概况或数据窗格的
Flow
（流程）窗格下面，可看到
Create Calculated Field
（创
建计算字段）选项（见图
18-1
）。
图
18
-
1
：创建计算字段的动态菜单选项
点击此选项可以打开一个单独的窗口，在这里可以创建计算。对话框是空的，直到
为其指定一个计算（见图
18-2
）。
图
18
-
2
：空白的 Add Field（添加字段）对话框
创建计算字段的第二种方法是选择一个特定的数据字段。打开数据字段的菜单（点
｜
157
计算
击省略号…进行操作），这里能看到与图
18-2
中相同的
Add Field
（添加字段）对话框，
但现在选定的数据字段已经列在白色框中（见图
18-3
）。
图
18
-
3
：从一个特定的数据字段创建一个计算字段
这相当于从概况窗格菜单中单击
Create Calculated Field
（创建计算字段），然后单
击
Custom Calculation
（自定义计算）（见图
18-4
）。
图
18
-
4
：从概况窗格菜单中创建自定义计算
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.